Archaeological Investigations in Medicine Creek Reservoir, Nebraska

1949 ◽  
Vol 14 (4Part1) ◽  
pp. 278-284 ◽  
Author(s):  
Marvin F. Kivett

The Medicine Creek Valley of south-central Nebraska has for many years been known to contain within its limits important archaeological materials representing various periods of man's occupancy in the Central Plains. The region is climatically near the western limits of successful general farming. While the yearly precipitation averages about 23 inches, records show a variation in total from 11 to 38 inches. (Bason and others, 1939, pp. 4–6). This wide fluctuation in precipitation, often combined with extremely high temperatures during the growing season, makes the area one of agricultural uncertainty. Early White settlement in the valley was often retarded and in some instances completely checked as a result of severe but usually short-period droughts. Prehistoric horticultural groups subsisting in this region were undoubtedly subjected to the same unfavorable conditions. They, like the early- White settlers who were to follow, may have been forced at times to abandon the area temporarily and withdraw to a more favorable one.

1981 ◽  
Vol 18 (11) ◽  
pp. 1643-1652 ◽  
Author(s):  
M. Gascoyne ◽  
D. C. Ford ◽  
H. P. Schwarcz

Speleothems from four caves in south-central Vancouver Island have been analysed by the 230Th/234U method. Only speleothems from one cave, Cascade Cave, near Port Alberni, contained sufficient uranium for them to be dated. Twenty-seven ages determined for seven speleothems were found to cluster in two periods: 67–28 ka, corresponding to the Olympia interstadial, and <23–10 ka (or <15 ka if corrected for detrital thorium contamination), corresponding to the Fraser (late Wisconsin) deglaciation and Holocene periods. Two speleothems were found to be deposited in isotopic equilibrium with their seepage waters. Profiles of variations in δ18O of the calcite (δ18Oc) of each of the two deposits show a decrease of 1.3‰ over the growth period, 64–28 ka. At all times, δ18Oc was less than δ18O of modern calcite in the cave. Using modern cave temperature and the variation of δ18O of seawater over the dated period, the profiles of δ18Oc are interpreted in terms of a paleotemperature record for the Olympia interstadial in Vancouver Island. The results show a gradual cooling from 4 °C at 64 ka, to 0 °C between 35 and 28 ka. These results are consistent with conditions necessary for speleothem growth and with published work on surficial Wisconsin deposits in the area. No distinct, short-period warming or cooling events are seen in the record, probably due to thermal buffering by the adjacent ocean.


2017 ◽  
Vol 42 (6) ◽  
Author(s):  
Raksmont Ubonbal ◽  
Saijai Porsoongnoen ◽  
Jureerut Daduang ◽  
Sompong Klaynongsruang ◽  
Sakda Daduang

AbstractIntroduction:The tropical plant amylases involved in the fruit ripening stage is outstanding for their high activities in converting starch to sugars within a short period at high temperatures over 40°C.Methods:The α amylase iso-enzymes from Ok-Rong mango (Results:The enzyme was purified 105-fold with a final specific activity of 59.27 U mgConclusion:Two α amylase iso-enzymes were classified as members of the low-pI group of amylases with identical structure, properties and functions. They are mesophilic with high possibilities for application for many purposes.


2012 ◽  
Vol 55 (5) ◽  
pp. 415-419 ◽  
Author(s):  
I. Antkowiak ◽  
J. Pytlewski ◽  
A. Purczyńska ◽  
R. Skrzypek

Abstract. This study was carried out on 26 adult water (river) buffaloes (25 females and 1 male) imported in 2006 to an eco-tourism farm in the Wielkopolska province, Poland. During the growing season, animals were kept on a logged pasture covering an area of about 15 ha. The pasture was divided into three approximately equal parts, each with a different facility available for wallowing; i.e. pond, drainage ditch and stream. Behavioural observations were carried out three times in July and August 2007 in approximately 14-d intervals, each time during one day on a different part of the pasture, always between 06.00 and 16.00. The method of registration was instantaneous scan sampling, performed at approximately 60 min intervals. On the days of observations mean daily temperature varied from 20.2 to 20.8 °C. Grazing was the behaviour shown by the highest percentage of animals in the herd (58.6%), followed by rumination (28.2%), lying down (26.5%), wallowing (12.9%) and standing (1.4%). When they had access to a pond or ditch, the proportion of animals wallowing was twice as much compared to stream access (P<0.05). It was concluded that the welfare of the investigated buffaloes was not compromised during the high summer temperatures that can be encountered in Poland. Results also indicate that the highest level of welfare can be reached in this time of year when animals are provided with access to ample facility for wallowing. Under our climatic conditions facilities with still or slowly moving water appeared to be preferred by river buffaloes. However, this study has a limitation which is short period of observation, thus it is possible that a longer and more representative period of observations could change these conclusions.


2019 ◽  
Vol 15 ◽  
pp. 01011
Author(s):  
A. Nesbitt ◽  
S. Dorling ◽  
R. Jones

As cool climate viticulture rapidly expands, the England and Wales wine sector is winning international acclaim, particularly for its sparkling wines, and is attracting significant investment. Supported by warming climate trends during the growing season, wine producers are establishing new vineyards planted predominantly with Pinot Noir and Chardonnay. Grape-friendly weather conditions in 2018 led to a record harvest and may be a sign of good things to come. Long term (100-years) Growing Season Average Temperatures (GSTs) in south-east and south-central England have noticeably increased with 6 of the top 10 warmest growing seasons (April–October), over the last 100 years, occurring since 2005. However, weather and growing season conditions fluctuate markedly from year to year, meaning that yields and grape quality continue to vary significantly. Weather extremes are anticipated to become more frequent under future climate change, further threatening the stability of production. Current uncertainty over future climatic conditions during the growing season and their potential effects on viticulture in the UK exposes both existing producers and potential investors to unquantified risks and opportunities. The CREWS-UK climate resilience research project is generating actionable information on how climate change may affect the wine production sector, to support better decision-making and investment.


Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 755
Author(s):  
Anna Gagliardi ◽  
Federica Carucci ◽  
Stefania Masci ◽  
Zina Flagella ◽  
Giuseppe Gatta ◽  
...  

Water deficit and high temperatures are the main environmental factors which affect both wheat yield and technological quality in the Mediterranean climate. The aim of the study was to evaluate the variation in the gluten protein assembly of four durum wheat genotypes in relation to growing seasons and different nitrogen levels. The genotypes, Marco Aurelio, Quadrato, Pietrafitta and Redidenari, were grown under three nitrogen levels (36, 90 and 120 kg ha−1) during two growing seasons in Southern Italy. Significant lower yield and a higher protein concentration were observed in the year characterized by a higher temperature at the end of the crop cycle. The effect of the high temperatures on protein assembly was different for the genotypes in relation to their earliness. Based on PCA, in the warmer year, only the medium-early genotype Quadrato showed positive values along the “protein polymerization degree” factor, while the medium and medium-late genotypes, Marco Aurelio and Pietrafitta showed negative values along the “proteins assembly” factor. No clear separation along the two factors was observed for the early genotype Redidenari. The variation in gluten protein assembly observed in the four genotypes in relation to the growing season might help breeding programs to select genotypes suitable for facing the ongoing climate changes in Mediterranean area.


2020 ◽  
Vol 59 (3) ◽  
pp. 381-400
Author(s):  
Mikael P. Hiestand ◽  
Andrew M. Carleton

AbstractSpatial variations in land use/land cover (LULC) in the Midwest U.S. Corn Belt—specifically, deciduous forest and croplands—have been suggested as influencing convective rainfall through mesoscale circulations generated in the atmosphere’s boundary layer. However, the contributing role of latent and sensible heat fluxes for these two LULC types, and their modulation by synoptic weather systems, have not been determined. This study compares afternoon averages of convective fluxes at two AmeriFlux towers in relation to manually determined synoptic pressure patterns covering the nine growing seasons (1 May–30 September) of 1999–2007. AmeriFlux tower U.S.-Bo1 in eastern Illinois represents agricultural land use—alternating between maize and soybean crops—and AmeriFlux tower U.S.-MMS in south-central Indiana represents deciduous forest cover. Phenologically, the latent and sensible heat fluxes vary inversely across the growing season, and the greatest flux differences between cropland and deciduous forest occur early in the season. Differences in the surface heat fluxes between crop and forest LULC types vary in magnitude according to synoptic type. Moreover, statistically significant differences in latent and sensible heat between the forest and cropland sites occur for the most frequently occurring synoptic pattern of a low pressure system to the west and high pressure to the east of the Corn Belt. The present study lays the groundwork for determining the physical mechanisms of enhanced convection in the Corn Belt, including how LULC-induced mesoscale circulations might interact with synoptic weather patterns to enhance convective rainfall.


1971 ◽  
Vol 12 (4) ◽  
pp. 545-556 ◽  
Author(s):  
Anthony Atmore ◽  
J. M. Chirenje ◽  
S. I. Mudenge

Any survey of the effects of the possession and use of firearms among the Tswana and, to the north of them, the Ndebele and Shona peoples, must start with a brief investigation of firearms among the Khoikhoi and the mixed Khoikhoi-white groups. The latter were in some respects the vanguard of the expansions of the white frontier in southern Africa. They originated in unions between Khoikhoi and white hunters, traders and farmers, and probably never existed without firearms; from an early date they also acquired horses. In the middle years of the eighteenth century the Khoikhoi-whites and the Khoikhoi peoples, whose economic basis and political structure had been broken by various aspects of white settlement amongst them, were being armed by the whites to take part in commando expeditions against the San. There is evidence that some Khoikhoi trekked from the colony to avoid this service.


1983 ◽  
Vol 63 (3) ◽  
pp. 695-709 ◽  
Author(s):  
S. I. WARWICK ◽  
R. D. SWEET

A summary of biological information is provided on two species of Galinsoga — G. parviflora (small-flowered galinsoga) and G. quadriradiata (hairy galinsoga). Originating in Central America, both species are weeds of disturbed habitats and agricultural areas, occurring in most of the temperate and subtropical regions of the world. In recent years the galinsogas have become troublesome weeds of low-growing vegetable crops in northeastern North America. The two species serve as alternate hosts for many insects, viruses and nematodes which affect crop species. Both species possess several features which predispose them to weediness and contribute to a rapid buildup of populations after an initial infestation. These include lack of seed dormancy, lack of special requirements for germination, rapid seedling development, the ability to flower after a short period of vegetative growth, the production of flowers and fruits throughout the growing season, the production of several generations in a single growing season, self-compatibility and the production of large numbers of viable seeds under a wide range of environmental circumstances.Key words: Galinsoga parviflora, G. quadriradiata, biology


2021 ◽  
Author(s):  
◽  
Julia Wells

<p>Historians have extensively studied colonial doctors in Africa, and the connection between colonial medical services and imperial power. The focus has, however, fallen almost exclusively on medical practice by trained, qualified, and professional doctors and nurses, and neglected amateur treatments carried out by white settlers. This project explores amateur medical treatment in rural parts of British East and South-Central Africa, primarily Kenya and Rhodesia, between 1890 and 1939. It draws upon a range of memoirs, novels, letters, and advice books, most notably the memoirs of white settler women including Karen Blixen, Elspeth Huxley, Hylda Richards, and Alyse Simpson.   The time period is characterised by a marked contrast between the emergence of tropical medicine and hygiene on the one hand, and, on the other, a continuation of nineteenth-century medical ideas, techniques, and widespread fears of the tropical climate. During the 1890s, tropical medicine and hygiene developed as specialised professional fields of expertise. Yet despite substantial tropical medical advances during and after the 1890s, the disease environment of East and South-Central Africa remained associated with high mortality and morbidity for white settlers. White bodies continued to be viewed, in the popular mind, as profoundly vulnerable to the African environment. Pre-germ theory etiologies of disease and treatment techniques persisted within white settler communities.  This thesis studies the medical skills, ideas, and practices of white settlers in the region. It demonstrates that much of settlers’ medical care was performed by other settlers, positioning amateur treatment as crucial to colonial health. The discussion considers advice produced and disseminated through the flourishing print culture of African guidebooks and tropical medical handbooks; tropical outfitting; the translation of popular medical and hygiene advice into white settler practice; and the amateur treatment techniques (most importantly, quinine, alcohol, and disinfectant) and body protection methods that feature in memoirs and letters. Malaria forms a major theme in amateur treatment and prevention. The thesis also examines white settler women’s amateur medical practice in African communities, and the shifting patterns of agency and colonial hegemony within these intimate medical encounters. It argues that settlers’ medical practice displayed a distinctive set of techniques and ideas that adapted, re-worked, and re-interpreted professional medical advice. It concludes that settlers’ amateur medical practice formed an essential element of colonial medicine and bolstered British authority in the region.</p>


2007 ◽  
Vol 8 (1) ◽  
pp. 44 ◽  
Author(s):  
Tamra A. Jackson ◽  
Robert M. Harveson ◽  
Anne K. Vidaver

Goss's bacterial wilt and blight, also known as leaf freckles and wilt was first identified in Dawson Co. in south central Nebraska in 1969. The disease was soon identified in 54 Nebraska counties and six bordering states. Widespread development of symptoms in NE, WY, and CO early in the 2006 growing season led to submission of more than 50 samples to the UNL Panhandle Research and Extension Center's Plant Disease Diagnostic Clinic in Scottsbluff, NE for analysis. Pathogen identification was made based on a combination of test results. Accepted for publication 5 April 2007. Published 19 September 2007.


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